US5694984A - Strapping tool with improved punches - Google Patents
Strapping tool with improved punches Download PDFInfo
- Publication number
- US5694984A US5694984A US08/746,120 US74612096A US5694984A US 5694984 A US5694984 A US 5694984A US 74612096 A US74612096 A US 74612096A US 5694984 A US5694984 A US 5694984A
- Authority
- US
- United States
- Prior art keywords
- punch
- wall
- strap
- short
- relief
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000001154 acute effect Effects 0.000 claims abstract description 6
- 238000004901 spalling Methods 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 7
- 239000010959 steel Substances 0.000 abstract description 7
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B13/00—Bundling articles
- B65B13/18—Details of, or auxiliary devices used in, bundling machines or bundling tools
- B65B13/24—Securing ends of binding material
- B65B13/30—Securing ends of binding material by deforming the overlapping ends of the strip or band
- B65B13/305—Hand tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
Definitions
- This invention pertains to a strapping tool of the type used to apply a steel strap in a tensioned loop around a package which joins the strap through an series of interlocking joints that are comprised of interlocking shoulders punched into the overlapping ends of the strap by internal tooling punches so as to seal-lessly join the strap ends.
- This invention provides an improved punch design which increases the wear life of the punch and facilitates de-coupling between the punch and strap after the shoulders are formed.
- Strapping tools of a type in wide-spread use are designed to tension the overlapped ends of a steel strap which are drawn from a supply and are wrapped around a package or load before interlockable shoulders are punched into the overlapped ends of a steel strap, wherein they are then cut from the supply. When the tool releases the joined straps from the tool, a tightly tensioned loop having such punched, interlocking shoulders is formed.
- a strapping tool of the type noted above is exemplified in Tremper et al. U.S. Pat. No. 4,825,512.
- strapping tools of the type noted above are electrically or pneumatically powered and have separate motors for respectively tensioning the straps together and for punching and cutting the straps, while manually operated versions use lever-action to perform these same functions.
- manual operated versions use lever-action to perform these same functions.
- Recent trends have found much broader applications for such strapping and binding operations, and as a result, a necessity to use straps which are thicker, namely 0.025-0.031 inches, are needed to withstand the forces of larger loads.
- FIG. 2 illustrates a perspective view of two straps having been punched and sealed together by the above-mentioned strapping tool.
- punch and die operations can appreciate that when forming the short shoulders 18, 20 of the interlocking joint 16, a highly concentrated stamping load is experienced on the corresponding punch surfaces that form the shoulders. Moreover, those stamping forces are highly concentrated over a very small punch surface area. As a result of the concentrated punch stresses, the punch surfaces become spalled, thereby compromising the formation of the interlocking shoulders.
- Another problem with the thicker straps is related to the higher tensioning loads that interlock the straps together after the joints are punched and released. As will become clearer later, the punched strap shoulders vertically scrape against corresponding edges on the punch as a result of the higher tensioning loads, eventually leading to spalling of the cornets of the punch shoulders.
- the improved punches of the kind used in the type of strapping machine previously discussed are provided with relieved edge surfaces on that part of the punch dedicated to stamping the shoulders of the interlocking joint.
- the relieved shoulders eliminate highly concentrated compressive loads on the punches by distributing those same loads over a broader surface area. Furthermore, the relieved shoulders reduce the severity of the scrapping action occurring along the punch edges and the corners when the interlocking joints are removed from the punch.
- FIG. 1 is a perspective view of a strapping tool showing the relative position of both straps in respect to the punches used for forming a seal-less joint therein;
- FIG. 2 is a perspective view showing the seal-less joints punched by the strapping machine of FIG. 1;
- FIG. 3 is a top view of two superposed straps emphasizing the Z-shaped configuration of the interlocking shoulders that form the joints;
- FIG. 4 is a sectional side view taken along line IV--IV of FIG. 3, with each strap in the interlocked position;
- FIG. 5 is an end sectional view of a simplified prior art punch and die arrangement emphasizing the concentration of punching forces on the outer punch edges;
- FIG. 6 is a top view of a prior art punch used in the strapping tool of FIG. 1 to form the Z-shaped interlocking shoulders;
- FIG. 7 is a side view of the punch shown in FIG. 6;
- FIG. 8 is a partial side view in section of a simplified punch and die arrangement of the present invention showing the outer punch edges being subjected to scrapping action under strap tension release;
- FIG. 9 is a top view of the punch of the present invention showing the relieved punch edges on the shoulders of the punch which form interlocking Z-shaped slits;
- FIG. 10 is a fragmented sectional view of one of the relieved edges identified in FIG. 9;
- FIG. 11 is an end sectional view of a simplified punch and die arrangement of the present invention emphasizing that strap cutting starts at the stronger, inside corners of the punch.
- FIG. 12 is a partial side view showing the less acute angle for scrapping after release of the strap tension.
- a strapping tool or machine 5 of the type noted above is shown with two ends of steel strap inserted therein for joining together.
- the strapping tool 5 is used for applying the steel strap 12 in a tensioned loop around a package 10 by joining the two strap ends by means of several interlocking joints 16, as best seen in FIG. 2.
- a die (not shown) and punch 50 arrangement within the bottom of strapping tool 5 are part of a mechanism for admitting the overlapped end 32 into the tool, before the superposed strap ends are mechanically self-tensioned by one of two internal motors (not shown).
- the second motor controls operation of the punch and die arrangement so as to retain the overlapped ends and to simultaneously stamp a series of interlockable shoulders into each strap. Once the stamping operation is completed, the overlapped straps are now seal-lessly joined together and are released from tool 5.
- strap 12 now has a wave-like appearance immediate in the strap area that was exposed to the stamping operation; this appearance is the result of the punch and die interaction and has functional significance in the operation of the interlocking of the straps, as will become clearer shortly.
- the seal-less strap connection comprises six corresponding joints 16 which are arranged in side-by-side pairs so as to form two longitudinal rows.
- each joint 16 is defined by a similar Z-shaped slit 22 formed into upper strap end 12 and lower strap end 14, of which a part of said Z-shape is downwardly configured during the stamping operation so as to create the wave-like appearance seen in FIG. 2.
- Each joint 16 is comprised of a short shoulder 18 and a long shoulder 20. It should be understood that reference characters 18 and 20 will refer to shoulders of the joint formed in the upper strap end 12, while the reference characters 24 and 26 will refer to the short and long shoulders of the joint formed on the lower strap end 14.
- FIG. 4 illustrates a longitudinally shifted set of strap ends 12, 14, where joints 16 are shown "locked".
- the wave-like profile in the joined straps helps to promote and maintain the interlocking of the shoulders.
- FIG. 6 is intentionally shown positioned below FIG. 4 so that a general correlation can be made between the punch surfaces and the Z-shaped slits, as well as the wave-like profile remaining in the straps after stamping.
- FIG. 7 is a side view of the punch of FIG. 5, and it is seen that punch 50 has a generally planar bottom surface 60 for attaching to machine 5 through guidepins and screws (not shown) which respectively interact with throughbores 65 and threaded holes 67; these holes pass from bottom wall 60 to top surface 52.
- the top wall 52 is defined by a series of arcuate, interconnecting segments 53 that also interconnect with side walls 62 and end walls 64.
- the side walls each have opposed protuberances formed thereon which are defined by a long wall 58 and a short wall 56.
- the long and short walls also define respective long and short top edge surfaces 57, 55 where top wall 52 joins side walls 62.
- punch 50 and the die (not shown) interact, it can be appreciated that the superposed strap ends 12, 14 are physically stamped so as to be advanced downwardly against top surface 52, and correspondingly against punch short and long edges 55, 57 of short and long walls 56, 58, respectively.
- each punch short edge and long edge 55, 57 cuts the Z-shaped slit simultaneously into each of upper and lower strap ends 12, 14.
- FIG. 5 illustrates, a highly concentrated compressive load occurs at the outer corners.
- edges 55 and 57 experience extreme line-loaded compressive forces, especially along the relatively shorter edges 55, causing them to become spalled after a relatively short period of use. The spalled edges entirely compromise the integrity of the seal-less joints.
- punch 50 was provided with relieved corners C', which are defined by relieved or extended short and long edges 55' or 57' on each of the walls 56 and 58 that were shown in FIG. 6, as best seen from viewing FIGS. 9 and 10.
- relieved corners C' are defined by relieved or extended short and long edges 55' or 57' on each of the walls 56 and 58 that were shown in FIG. 6, as best seen from viewing FIGS. 9 and 10.
- FIG. 11 illustrates, the cutting of the slits actually starts towards the inside corners D' of the punch, where stronger, and larger edge surfaces lie. Relief of these surfaces thereby eliminates the spalling problems caused solely by stamping.
- FIG. 12 shows, whenever the edges are relieved, a less acute angle (less than 90°) is formed on the punch, also favorably eliminating the chipping and spalling problems related solely to the strap tensioning forces during strap release.
- FIG. 10 shows, it is preferable to provide said relief at an angle ⁇ of up to 10°, and to a depth X of about 0.015 inches. In this way, stamping forces are now distributed across the wider surface edge area W, without compromising the ability of punch 50 to properly form the Z-shaped slits that eventually create each joint 16. It should be clear that the angle of ⁇ is greater than 10°, the relief surface edge area W will become smaller.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Basic Packing Technique (AREA)
Abstract
Description
Claims (4)
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/746,120 US5694984A (en) | 1996-11-06 | 1996-11-06 | Strapping tool with improved punches |
CA002219187A CA2219187C (en) | 1996-11-06 | 1997-10-22 | Strapping tool with improved punches |
NZ329086A NZ329086A (en) | 1996-11-06 | 1997-10-31 | Strapping tool punch with relief to prevent spalling of formed joint |
EP97308819A EP0841248B1 (en) | 1996-11-06 | 1997-11-04 | Strapping machine punch |
TW088204339U TW379719U (en) | 1996-11-06 | 1997-11-04 | strapping tool with improved punches |
DE69704142T DE69704142T2 (en) | 1996-11-06 | 1997-11-04 | Press stamp for a strapping device |
CN97122436A CN1072154C (en) | 1996-11-06 | 1997-11-05 | Strapping tool with improved punches |
JP9304304A JPH10167213A (en) | 1996-11-06 | 1997-11-06 | Punch for band stretching device |
KR1019970058384A KR100275236B1 (en) | 1996-11-06 | 1997-11-06 | Punch |
AU45300/97A AU690502B1 (en) | 1996-11-06 | 1997-11-21 | Strapping tool with improved punches |
JP2007340113A JP2008094501A (en) | 1996-11-06 | 2007-12-28 | Punch for strapping tool |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/746,120 US5694984A (en) | 1996-11-06 | 1996-11-06 | Strapping tool with improved punches |
Publications (1)
Publication Number | Publication Date |
---|---|
US5694984A true US5694984A (en) | 1997-12-09 |
Family
ID=24999563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/746,120 Expired - Lifetime US5694984A (en) | 1996-11-06 | 1996-11-06 | Strapping tool with improved punches |
Country Status (10)
Country | Link |
---|---|
US (1) | US5694984A (en) |
EP (1) | EP0841248B1 (en) |
JP (2) | JPH10167213A (en) |
KR (1) | KR100275236B1 (en) |
CN (1) | CN1072154C (en) |
AU (1) | AU690502B1 (en) |
CA (1) | CA2219187C (en) |
DE (1) | DE69704142T2 (en) |
NZ (1) | NZ329086A (en) |
TW (1) | TW379719U (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1364877A1 (en) * | 2002-05-24 | 2003-11-26 | Orgapack GmbH | Punching tool for a strapping device |
KR100636004B1 (en) * | 1999-04-09 | 2006-10-18 | 일리노이즈 툴 워크스 인코포레이티드 | Sealless strapping tool and method therefor |
US20060288539A1 (en) * | 2005-05-26 | 2006-12-28 | Panduit Corp. | Displacement lock mlt |
US20070261754A1 (en) * | 2006-05-09 | 2007-11-15 | Illinois Tool Works Inc. | Reduced force sealless connection mechanism |
US20090000082A1 (en) * | 2007-05-30 | 2009-01-01 | Panduit Corp. | Cable Tie Having Band Thread Force Reduction |
WO2016014167A1 (en) * | 2014-07-21 | 2016-01-28 | Signode Industrial Group Llc | Electrically powered combination hand-held strapping tool |
US10464699B2 (en) | 2011-10-04 | 2019-11-05 | Signode Industrial Group Llc | Sealing tool for strap |
US10577137B2 (en) | 2015-12-09 | 2020-03-03 | Signode Industrial Group Llc | Electrically powered combination hand-held notch-type strapping tool |
US20210213638A1 (en) * | 2018-06-19 | 2021-07-15 | Lumileds Holding B.V. | Strapping cutter |
WO2021243090A1 (en) * | 2020-05-27 | 2021-12-02 | Golden Bear LLC | Strapping tool |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4825512A (en) * | 1987-12-02 | 1989-05-02 | Signode Corporation | Sealless strap connection |
US5029433A (en) * | 1988-12-09 | 1991-07-09 | Hoesch Aktiengesellschaft | Strapper |
US5526852A (en) * | 1994-06-13 | 1996-06-18 | Rakovski; Zvonko | Punching and stamping tool |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH378223A (en) * | 1960-05-02 | 1964-05-31 | Fromm Gmbh A | Tensioning and locking device for hoops |
DE1225543B (en) * | 1963-08-28 | 1966-09-22 | Timmerbeil Erich | Device for joining the ends of straps |
JPH01172425A (en) * | 1987-12-28 | 1989-07-07 | Teijin Ltd | Preparation of modified polyester |
JP2642117B2 (en) * | 1988-02-02 | 1997-08-20 | 株式会社アマダ | Die for punching |
US5286852A (en) * | 1988-07-06 | 1994-02-15 | Verigen, Inc. | Antibodies specific towards HIV-1 gp 48 |
CH678416A5 (en) * | 1988-12-15 | 1991-09-13 | Nestle Sa | |
JP2567783B2 (en) * | 1992-04-28 | 1996-12-25 | 株式会社アイピーシー | Engine manifold flange manufacturing method |
-
1996
- 1996-11-06 US US08/746,120 patent/US5694984A/en not_active Expired - Lifetime
-
1997
- 1997-10-22 CA CA002219187A patent/CA2219187C/en not_active Expired - Fee Related
- 1997-10-31 NZ NZ329086A patent/NZ329086A/en not_active IP Right Cessation
- 1997-11-04 EP EP97308819A patent/EP0841248B1/en not_active Expired - Lifetime
- 1997-11-04 TW TW088204339U patent/TW379719U/en not_active IP Right Cessation
- 1997-11-04 DE DE69704142T patent/DE69704142T2/en not_active Expired - Lifetime
- 1997-11-05 CN CN97122436A patent/CN1072154C/en not_active Expired - Fee Related
- 1997-11-06 JP JP9304304A patent/JPH10167213A/en not_active Withdrawn
- 1997-11-06 KR KR1019970058384A patent/KR100275236B1/en not_active IP Right Cessation
- 1997-11-21 AU AU45300/97A patent/AU690502B1/en not_active Ceased
-
2007
- 2007-12-28 JP JP2007340113A patent/JP2008094501A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4825512A (en) * | 1987-12-02 | 1989-05-02 | Signode Corporation | Sealless strap connection |
US5029433A (en) * | 1988-12-09 | 1991-07-09 | Hoesch Aktiengesellschaft | Strapper |
US5526852A (en) * | 1994-06-13 | 1996-06-18 | Rakovski; Zvonko | Punching and stamping tool |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100636004B1 (en) * | 1999-04-09 | 2006-10-18 | 일리노이즈 툴 워크스 인코포레이티드 | Sealless strapping tool and method therefor |
US20040007283A1 (en) * | 2002-05-24 | 2004-01-15 | Flavio Finzo | Punching/deforming tool for a strapping unit |
US7128099B2 (en) | 2002-05-24 | 2006-10-31 | Orgapack Gmbh | Punching/deforming tool for a strapping unit |
EP1364877A1 (en) * | 2002-05-24 | 2003-11-26 | Orgapack GmbH | Punching tool for a strapping device |
US7373695B2 (en) | 2005-05-26 | 2008-05-20 | Panduit Corp. | Displacement lock MLT |
US20060288539A1 (en) * | 2005-05-26 | 2006-12-28 | Panduit Corp. | Displacement lock mlt |
US7603751B2 (en) | 2005-05-26 | 2009-10-20 | Panduit Corp. | Displacement lock MLT |
US20080209692A1 (en) * | 2005-05-26 | 2008-09-04 | Panduit Corp. | Displacement lock mlt |
EP1857367A2 (en) * | 2006-05-09 | 2007-11-21 | Illinois Tool Works Inc. | Reduced force sealless connection mechanism |
US7350543B2 (en) | 2006-05-09 | 2008-04-01 | Illinois Tool Works Inc. | Reduced force sealless connection mechanism |
EP1857367A3 (en) * | 2006-05-09 | 2008-11-19 | Illinois Tool Works Inc. | Reduced force sealless connection mechanism |
US20070261754A1 (en) * | 2006-05-09 | 2007-11-15 | Illinois Tool Works Inc. | Reduced force sealless connection mechanism |
US20090000082A1 (en) * | 2007-05-30 | 2009-01-01 | Panduit Corp. | Cable Tie Having Band Thread Force Reduction |
US8225461B2 (en) | 2007-05-30 | 2012-07-24 | Panduit Corp. | Cable tie having band thread force reduction |
US10464699B2 (en) | 2011-10-04 | 2019-11-05 | Signode Industrial Group Llc | Sealing tool for strap |
US11718430B2 (en) | 2011-10-04 | 2023-08-08 | Signode Industrial Group Llc | Sealing tool for strap |
US10308383B2 (en) | 2014-07-21 | 2019-06-04 | Signode Industrial Group Llc | Electrically powered combination hand-held strapping tool |
EP3552981A1 (en) * | 2014-07-21 | 2019-10-16 | Signode Industrial Group LLC | Electrically powered combination hand-held strapping tool |
WO2016014167A1 (en) * | 2014-07-21 | 2016-01-28 | Signode Industrial Group Llc | Electrically powered combination hand-held strapping tool |
US11084610B2 (en) | 2014-07-21 | 2021-08-10 | Signode Industrial Group Llc | Electrically powered combination hand-held strapping tool |
US11492158B2 (en) | 2014-07-21 | 2022-11-08 | Signode Industrial Group Llc | Electrically powered combination hand-held strapping tool |
US10577137B2 (en) | 2015-12-09 | 2020-03-03 | Signode Industrial Group Llc | Electrically powered combination hand-held notch-type strapping tool |
US20210213638A1 (en) * | 2018-06-19 | 2021-07-15 | Lumileds Holding B.V. | Strapping cutter |
WO2021243090A1 (en) * | 2020-05-27 | 2021-12-02 | Golden Bear LLC | Strapping tool |
US11560247B2 (en) | 2020-05-27 | 2023-01-24 | Golden Bear LLC | Strapping tool |
US11919666B2 (en) | 2020-05-27 | 2024-03-05 | Golden Bear LLC | Strapping tool |
Also Published As
Publication number | Publication date |
---|---|
JPH10167213A (en) | 1998-06-23 |
EP0841248A1 (en) | 1998-05-13 |
DE69704142D1 (en) | 2001-04-05 |
AU690502B1 (en) | 1998-04-23 |
CN1182030A (en) | 1998-05-20 |
DE69704142T2 (en) | 2001-07-19 |
EP0841248B1 (en) | 2001-02-28 |
CA2219187A1 (en) | 1998-05-06 |
CA2219187C (en) | 2001-01-09 |
NZ329086A (en) | 1998-05-27 |
JP2008094501A (en) | 2008-04-24 |
CN1072154C (en) | 2001-10-03 |
KR19980042156A (en) | 1998-08-17 |
KR100275236B1 (en) | 2000-12-15 |
TW379719U (en) | 2000-01-11 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: ILLINOIS TOOL WORKS INC., ILLINOIS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHEUNG, NELSON;REEL/FRAME:008249/0597 Effective date: 19961104 |
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Year of fee payment: 8 |
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FPAY | Fee payment |
Year of fee payment: 12 |
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AS | Assignment |
Owner name: PREMARK PACKAGING LLC, ILLINOIS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ILLINOIS TOOL WORKS INC.;REEL/FRAME:032513/0423 Effective date: 20140116 |
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AS | Assignment |
Owner name: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT, DE Free format text: SECURITY INTEREST;ASSIGNOR:PREMARK PACKAGING LLC;REEL/FRAME:032814/0305 Effective date: 20140501 |
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AS | Assignment |
Owner name: SIGNODE INDUSTRIAL GROUP LLC, ILLINOIS Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:JPMORGAN CHASE BANK, N.A.;REEL/FRAME:045825/0133 Effective date: 20180403 |